Engine-Codes - Mazda - B13C3 MAZDA

B13C3 MAZDA Code - LF Control Unit

- Code Popularity: 4,626 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the B13C3 MAZDA Code?

  • Faulty LF Control Unit
  • LF Control Unit harness is open or shorted
  • LF Control Unit circuit poor electrical connection
  • Faulty Start Stop Unit

|How to Fix the B13C3 MAZDA Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|B13C3 MAZDA code tech notes

DTC B13C3-04: LF CONTROL UNIT INTERNAL MALFUNCTION
DTC B13C3-09: LF CONTROL UNIT MALFUNCTION
DTC B13C3-16: LF CONTROL UNIT POWER SUPPLY VOLTAGE LOW INPUT
DTC B13C3-29: COMMUNICATION ERROR BETWEEN STRAT STOP UNIT AND LF CONTROL UNIT

|What is the cost to diagnose the B13C3 MAZDA code?

Labor: 1.0

The cost to diagnose the B13C3 MAZDA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are B13C3 MAZDA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B13C3 MAZDA Code Mean?

With the communication between the start stop unit and LF control unit being performed normally, there is no response from the LF control unit even though there is the signal transmission request from the start stop unit to the LF control unit, and the LF state signal becomes low.

LF Control Unit

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